328 ON NAIAS GRAMINEA DEL., VAR. DELILEI MAGNUS. 
soil, but they would not germinate there. 
by the carding-engines. The refuse is turned out of the mill into 
the yard, whence the wind and other agencies transport the fruits 
into the tepid-water of the canal; here they meet with a suitable 
nidus for germination and growth, and the result is the appearance 
of an alien in our flora, 
these surmises have any substratum of truth, the Naias may 
ur in any mill-pond connected with works where Egyptian 
cotton is used, and where the water is raised to a permanently high 
temperature by the condensation of steam from the boiler. 
canals of that neighbourhood may be expected to contain Naias 
yp 
el., Chara Braunii Gmel., &e. 
gyptian origin of the plant is to some extent confirmed 
* ‘Mémoire sur les plantes qui croissent spontanément en Egypte,’ vol. ii, 
pp. 16, 17, 
